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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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(ABSD)
AutoBahnTM Support Device
The ABSD is a bi-directional repeater for use in a serial AutoBahn databus environment. It is a completely asynchronous part. No clock will be used. During data transmission via the serial system bus, the ABSD receives data from the serial system bus and transmits the data to the receiving AutoBahn. Vice versa, the ABSD transmits data from the AutoBahn on the local side to the serial system bus. The direction of the transmission is automatically determined by the activities at the serial bus I/O's. The ABSD is able to handle a data collision, but no collision detect is provided. A disable pin, which will be controlled by the AutoBahn board, supports the live insertion function. Enabling the ABSD requires a deassertion of the disable signal and a cutoff state at the serial system bus.
MC100SX1452
AUTOBAHNTM SUPPORT DEVICE
ABSD
* * * * * * *
Bi-Directional Data Transmission Up to 1600MBit/s 8-Pin CLCC Package Differential Data I/Os Enables Live Insertion Self-Detecting Transmission Direction Enables Up to 21 Nodes Impedance Controlled Termination
FI SUFFIX CERAMIC CLCC PACKAGE CASE TBD
The ABSD supports variable data transfer rates of 400Mbit/s, 800Mbit/s and 1600Mbit/s. This enables the usage in combination with all AutoBahn SpanceiverTM components. The ABSD will be used either as an active impedance controlled access node to a serial bus system, or it will act as a cable driver or line repeater. Motorola's MOSAIC VTM process allows high speed designs up to 3GHz. The design is implemented with a flow-through pinout architecture. The ABSD chip works from a single +5V supply.
EN
TX-DRIVER LOCAL LOCAL VCC
EN
DIRECTION CONTROL
SER SER
RX-DRIVER DISABLE RESET POWER UP
Figure 1. Simplified Block Diagram
AutoBahn and Spanceiver are trademarks of PEP Modular Computers. `Spanceiver' has been formed as a contraction of Serial/Parallel Transceiver. MOSAIC V is a trademark of Motorola, Inc. This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. 6/97
(c) Motorola, Inc. 1997
1
REV 0
MC100SX1452
Table 1. PIN DESCRIPTIONS
Signal DISABLE SER SER LOCAL LOCAL Pin No 3 6 5 1 2 Direction In I/O I/O I/O I/O Level PCT CUTOFF-PECL CUTOFF-PECL CUTOFF-PECL CUTOFF-PECL Description Low level immediately enables the ABSD if the public bus is in cutoff. High level disables the ABSD Serial data I/O at the serial system bus Inverted serial data I/O at the serial system bus Serial data I/O connected to the local AutoBahn serial bus Inverted serial data I/O connected to the local AutoBahn serial bus
Power and Ground Pins GND VCC VCCO 4 8 7 Supply Supply Supply - - - Ground Positive supply Positive supply output drivers
BLOCK DIAGRAM FUNCTIONAL DESCRIPTION
MODES OF OPERATION
COLLISION DETECT
In the idle mode, when DIRECTION CONTROL recognizes data on the local side and on the public side at the same time, the ABSD goes to RECEIVE MODE. The signals on the SER/SER bus (back plane) are not disturbed. On the local bus a data-collision occurs and the local AutoBahn Spanceiver shows an error. POWER UP LOGIC When the voltage drops below 4.6V an internal RESET- signal is generated. RESET-LOGIC The DISABLE signal indicates to the ABSD the disconnection of the local AutoBahn Spanceiver or board from the back plane, e.g., during a self test or plug/unplug of the board. The DISABLE or the internal generated power up reset sets the internal logic to a known state. The RX-DRIVER and the TX-DRIVER are set to cutoff state. The DISABLE pin is terminated internally with a pull up resistor. TX-DRIVER The TX-DRIVER is a cutoff driver. The DIRECTION CONTROL circuit monitors the local bus. When a stable differential signal is detected the TX-DRIVER is enabled. RX-DRIVER The RX-DRIVER is a cutoff driver. The DIRECTION CONTROL circuit monitors the public bus. When a stable differential signal is detected the RX-DRIVER is enabled.
IDLE MODE
When RESET is active, both the RX-DRIVER and the TX-DRIVER are in cutoff. After enabling the part, the DRIVERs remain in cutoff state if there is no activity on the local and the public bus. If there is a data transfer running on the public bus after enabling the part, the ABSD switches to RECEIVE MODE.
RECEIVE MODE
In the idle mode, when DIRECTION CONTROL recognizes data on the public side, the ABSD switches to RECEIVE MODE. This means the RX-DRIVER becomes active and the TX-DRIVER remains in cutoff-state. Both buffers remain in their states until the public bus goes to a cutoff state. Then the RX-DRIVER is deasserted again and the logic returns to idle mode.
TRANSMIT MODE
In the idle mode, when DIRECTION CONTROL recognizes data on the local, side the ABSD switches to TRANSMIT MODE. This means the TX-DRIVER becomes active and the RX-DRIVER remains in cutoff-state. Both buffers remain in their states until the local bus goes to a cutoff state. Then the TX-DRIVER is deasserted again and the logic returns to idle mode.
MOTOROLA
2
ECLinPS and ECLinPS Lite DL140 -- Rev 3
MC100SX1452
SERIAL BUS IO CHARACTERISTICS To achieve best multipoint performance the serial IO's have lowest output impedance during transmit mode and high input impedance in receive mode. If the serial IO's are in a cutoff mode the DC input impedance is above 10K. During transmit mode (differential) the IO's show a output impedance of 6 - 8. TYPICAL SERIAL BUS APPLICATION The ABSD is a bi-directional repeater for the serial AutoBahn databus. It is a completely asynchronous part. No clock will be used. During data transmission via the serial system bus, the ABSD receives data from the serial system bus and transmits these data to the receiving AutoBahn. Vice versa, the ABSD transmits data from the AutoBahn on the local side to the serial system bus. The direction of the transmission is determined by the activities at the serial bus I/O's. The ABSD is able to handle a data collision, but no collision detect is provided.
CUTOFF
START UP PULSE
DIFFERENTIAL DATA VOH
SERI/O
VCUT
VOL
S
S
VOL SERI/O VCUT VOH S S
SERI/O
>10k
6-8
SERI/O
>10k
6-8
Figure 2. Output Driver Characteristics - Serial I/O (LOCAL and SER)
Backplane public bus
ABSD
ABSD
ABSD
local bus
local bus
local bus
SX1451
SX1451
SX1451
Board 1
Board 2
Board n
Figure 3. Serial Bus Application
ECLinPS and ECLinPS Lite DL140 -- Rev 3
3
MOTOROLA
MC100SX1452
DISABLE
SER SER LOCAL LOCAL Receive Mode 1
DISABLE
SER SER LOCAL LOCAL Receive Mode 2
DISABLE SER SER LOCAL LOCAL Receive Mode 3
Figure 4. Functional Timings
MOTOROLA
4
ECLinPS and ECLinPS Lite DL140 -- Rev 3
MC100SX1452
+5V 33pF +5V +5V 50 TRANSMISSION LINE 83 83
121 VCC VCCO DISABLE TO AUTOBAHN BOARD Connector +5V 83 33pF +5V 33pF 121 121 121 LOCAL GND LOCAL 83 121 50 TERMINATION OF LOCAL SERIAL BUS ABSD SER SER
121 33pF MINIMUM DISTANCE TO PUBLIC SERIAL BUS
+5V
83 33pF
83
33pF
Figure 5. ABSD Interface Design MAXIMUM RATINGS*
Symbol VCC, VCCO TA Parameter DC Supply Voltage (Referenced to GND) Operating Temperature Range (Ambient) Value -0.5 to +7.0 0 to +70 Unit V C
TSTG Storage Temperature Range -55 to +125 C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
DC CHARACTERISTICS
Symbol VCC, VCCO VIH VIcut VIL VP-PD VP-PC VOH VOcut VOL IOUT VIHTTL VILTTL IILTTL IIHTTL Supply Voltage PECL Input High Level PECL Input Cutoff Level PECL Input Low Level Input Swing Differential Input Swing Start-Up Pulse PECL Output High Level PECL Output Cutoff Level PECL Output Low Level PECL Output Current Input High TTL Input Low TTL Input Current Low Level Input Current High Level 2.0 pF -0.6 Continuous Surge 3.00 3.19 150 300 3.975 3.00 3.19 50 100 2.0 0.8 1200 1200 4.120 3.07 3.38 Characteristic Min 4.75 Typ Max 5.25 4.12 3.07 Unit V V V V mV mV V V V mA V V mA Vin = 0.5V Vin = 2.7V Note 1. Note 1. Note 1. Note 1. Note 1. Note 1. Note 1. Note 1. Condition
CINECL Input Capacitance 1. VCC = 5V; Output Load 25 to +3V.
ECLinPS and ECLinPS Lite DL140 -- Rev 3
5
MOTOROLA
MC100SX1452
DC CHARACTERISTICS
Symbol fmax DR tf, tr PH dDL pDL ten tde Characteristic Maximum Frequency Data Rate Rise and Fall Time Phase Variation Differential Delay Propagation Delay Enable Time Disable Time AC Load Vres Power-Up Threshold 2. VCC = 5V; Output Load 25 to +3V. 3. The propagation delay is not relevant for functionality. 4. This is equivalent to 21 nodes. 50 4.6 pF V Notes 2., 4. -25 -5 Min 0.9 1.8 Typ 1.0 2.0 150 +25 +5 Max Unit GHz GBit/s ps ps ps Condition Note 2. Note 2. 20%-80% at 50pF, 25 Note 2. Note 2. Note 3.
VCC VCCO 1 2 3 4 8 7 6 5 SER SER
LOCAL LOCAL
DIS GND
Figure 6. 8-Lead Pinout (Top View)
MOTOROLA
6
ECLinPS and ECLinPS Lite DL140 -- Rev 3
MC100SX1452
OUTLINE DIMENSIONS
FI SUFFIX CERAMIC CLCC PACKAGE CASE TBD ISSUE TBD
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 303-675-2140 or 1-800-441-2447 JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. 81-3-5487-8488
MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, - US & Canada ONLY 1-800-774-1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 INTERNET: http://motorola.com/sps
ECLinPS and ECLinPS Lite DL140 -- Rev 3 7
MC100SX1452/D MOTOROLA

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